<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* li {
            color: red;
        } */
        /* a {
            color: red;
        } */

        /* li a {
            color: red;
        } */

        /* #middle li {
            color: red;
        } */

        /* ul li a {
            color: red;
        }

        ol li a {
            color: red;
        } */

        /* #a1, #a2 {
            color: red;
        } */

        /* ul>a {
            color: red;
        } */

        /* * {
            color: green;
            font-size: 30px;
        } */

        .font32 {
            /* border-style: solid;
            border-width: 2px;
            border-color: green; */
            border: 2px green solid;
            height: 100px;
            width: 500px;
        }
        span {
            display: block;
            border: 2px green solid;
            width: 500px;
            height: 100px;
        }

    </style>
</head>

<body>
    <div class="font32">我是一个div, class为font32</div>
    <div class="font32">我是一个div, class为font32</div>
    <div><a href="#">我是一个div</a></div>
    <ul>
        <li>aaa</li>
        <li>bbb</li>
        <li><a href="#" id="a1">ccc</a></li>
    </ul>
    <ol>
        <li>1111</li>
        <li>2222</li>
        <li><a href="#" id="a2">3333</a></li>
    </ol>
    <!-- <ol>
        <li>1111</li>
        <li>2222</li>
        <li>3333</li>
    </ol> -->
    <button id="submit">提交</button>
    <span>span标签</span>
</body>

</html>